:root {
    --light-grey: rgba(255, 255, 255, 0.7);
    --white: rgba(255, 255, 255, 0.9);
}

@media screen and (max-width: 768px) {
    #page-header #nav {
        background: 0%;
        transition: 0s;
    }

}

.page .back-home-button {
    color: rgba(255, 255, 255, 0.7);
}

.page #nav #site-name span {
    color: var(--light-grey);
}

.nav-fixed #nav #site-name span{
    color: var(--heo-fontcolor);
}

#nav .site-page {
    color: rgba(255, 255, 255, 0.7);
}

#page-header.full_page {
    height: 100vh;
    background-attachment: fixed;
    border-radius: 0;
}

#page-header.full_page #site-info {
    position: absolute;
    top: 43%;
    padding: 0 10px;
    width: 100%;
}

#page-header #scroll-down {
    position: absolute;
    bottom: 0;
    width: 100%;
    cursor: pointer;
    z-index: 1;
    display: -webkit-box;
    display: -moz-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: box;
    display: flex;
    -webkit-box-align: center;
    -moz-box-align: center;
    -o-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
    -webkit-box-pack: center;
    -moz-box-pack: center;
    -o-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
}

#page-header #scroll-down .scroll-down-effects {
    position: relative;
    width: 100%;
    color: var(--light-grey);
    font-size: 30px;
}

/* 首页头图加载 */
.pl-container {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    will-change: transform;
    /* 添加性能优化 */
    animation: blur-to-clear 2s cubic-bezier(.62, .21, .25, 1) 0s 1 normal backwards running, scale 1.5s cubic-bezier(.62, .21, .25, 1) 0s 1 both;
}

.pl-img {
    width: 100%;
    height: 100%;
    position: absolute;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1s;
}

@keyframes blur-to-clear {
    0% {
        filter: blur(50px);
        opacity: 1;
    }

    100% {
        filter: blur(0);
        opacity: 1;
    }
}

@keyframes scale {
    0% {
        transform: scale(1.5) translateZ(0);
        opacity: 0;
    }

    to {
        transform: scale(1) translateZ(0);
        opacity: 1;
    }
}

.pl-visible {
    opacity: 1;
}

/* 为首页图片加上遮罩 */
.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    background: url();
}

.pl-blur {
    /* 小图锯齿多，增加高斯模糊 */
    filter: blur(50px);
}

#nav a {
    color: var(--light-grey);
}